'Children' in the Bible

The Spirit himself beareth witness with our spirit, that we are children of God:

and if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him , that we may be also glorified with him .

that the creation itself also shall be delivered from the bondage of corruption into the liberty of the glory of the children of God.

neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called.

That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.

for the children being not yet born, neither having done anything good or bad, that the purpose of God according to election might stand, not of works, but of him that calleth,

And Isaiah crieth concerning Israel, If the number of the children of Israel be as the sand of the sea, it is the remnant that shall be saved: